Master-die for forging dies for drop-hammers, presses, and the like.



. A. F. ARTHUR.

MASTER DIE FOR FORGING DIES FOR DROP HAMMERS, PRESSES, AND THE LIKE.

APPLICATION FILED APR.27. 1916.

l ,23 1,47Un Patented June 26, 1917.

NI @TATfi ATEN IQE.

ALBERT F. ARTHUR, OF CLEVELAND, OHIO, ASSIGN'OR TO THE CLEVELAND HARDWARE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MASTER-DIE FOB, FORGING DIES FOR DROP-HAMMERS, PRESSES, AND THE LIKE.

Specification of Letters Patent.

Patented June 2G, 1911*? Application filed April 27, 1916. Serial No. 93,836.

To all whom it may concern:

Be it known that I, ALBERT F. ARTHUR, a citizen of the United States, residing at Cleveland in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Master-Dies for Forging Dies for Drop-Hammers, Presses, and the like, of which the following is a full, clear, and exact description.

This invention relates to master dies adapted particularly for forging dies such as are employed in drop hammers and in presses for the production of commercial forgings.

The invention constituting the subjectmatter of this application is a modification of the master dies and methods of forging dies covered by certain co-pending applications filed by me and including the following, Serial N 0. 93,832, filed April 27, 1916, Method of forming dies, and Serial No. 93,834;, filed April 27, 1916, Composite die for drop hammers and the like. In said companion application I disclose a method of forgin dies by means of master dies, one of which is in the form of a hollow matrix having inwardly tapering walls and having at the base of the recess the pattern which is to be transferred, reproduced or forged in the body of heated metal. At the same time that the die is reproduced or forged in the metal the latter is provided with a locking lug or projection or is otherwise shaped to permit it to be conveniently and securely held in a shoe or holder which is to receive the die when the latter is used in a forging machine.

The dies constructed in accordance with the present invention include a hollow matrlx which receives the block or body of heated metal and a plunger or patrix having on its face the die to be reproduced and adapted to enter the recess of the matrix during the forgin process. This patrix'or plunger is provi ed adjacent the pattern with a retaining wall, rib or projectlon which is relied upon solely to hold the metal and prevent it from flowing or springing away from the pattern while the metal 1s compressed or forged by the dies.

My invention may be brlefly summarized as consisting in certain novel details of-construction, and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.

In the accompanying sheet of drawings, Figure 1 1s a cross-sectlonal view of master dies constructed in accordance with the pres ent invention, the same being shown in the act of forging a die from a block or body of heated metal; Fig. 2 is a face view of the master die or patrix carrying the finishing pattern; Fig. 3-is a face view of the matrix which receives the block of metal to be forged into the die and also receives the end of the patrix carrying the pattern or patterns; Fig. 4; is a view similar to Fig. 1, showing a modification; Fig. 5 is a face view of the matrix of Fig. 4:; and Fi 6 is a face view of the master die or patrix of Fig. 4 carrying the pattern or patterns.

Referring first to Figs. 1 to 3, it will be seen that the master dies include a matrix 10 which is adapted to receive a block or body of heated metal 11 to be forged into the die, and a plunger or patrix 12 which isadapted to enter the matrix and which carries on its face the die or dies to be reproduced or transferred into the die being forged from the block or body of metal 11. In this case the patrix is provided with a finishing die 13 and at the sides of the latter with rough ing-out or break-down dies 14, and additionally the patrix is provided adjacent the finishing pattern and partially surrounding portions of the latter with a retaining wall in the form of a rib or projection 15 which in this case is in two sections which are close to and extend part way around the end portions of the finishing pattern 13. The purpose of this retaining wall will be referred to presently.

The matrix 10 and patrix 12 are preferably provided with dovetail projections by which they may be secured in a forging ma chine such as drop hammer or press. Preferably, the matrix 10 is secured to the lower member of the forging machine and the patrix to the uppermember so that the matrix constitutes the lower master die and the patrix the upper master die. In case the forging is done in a drop hammer the matrix 10 will be secured to the base or anvil and the patrix 12 to the hammer or hammer head, and during the forging process the heated block of metal which is received in the matrix will be struck repeatedly by the patrix, the lower part of the patrix entering the recess of the matrix for a short distance so as to be guidedcby the latter.

In my prior applications previously referred to the pattern or patterns are at the base of the matrix, which is provided with inwardly tapering walls which taper from the open end of the matrix or recess inwardly to the face or base of the recess provided with the die pattern or patterns. In this case the matrix is provided withwalls which preferably taper outwardly slightly from the base of the recess so that the side walls of the recess do not serve to hold or force the metal inwardly toward the die pattern. In this case, however, in order that well defined sharp corners or lines may be formed I utilize theretaining wall 15 which extends either wholly or partially around the finishing pattern and durin the forging process this retaining wafi holds in the metal toward the pattern, prevents its springin or flowing away therefrom, and thus pro uces a very accurate die. This retaining wall serves also another purpose, and that is it protects the pattern from be ing broken by the lateral flowing or movement of the metal.

The retaining wall or walls may, if necessary, be provided around the roughing-out dies which are likewise forged in the block or body 11, although generally the roughing-out dies do not need the assistance of retaining walls for the reason that said roughing-out dies do not require sharp and well defined lines or corners.

After the die is forged in the manner above explained, the forged die after being allowed to cool somewhat so as to contract is drawn from the matrix and when given the shape illustrated in Fig. 1, that is to say, with the matrix shaped as shown in Fig. 1, the forged die will, after being removed from the matrix, be provided with a dove-tail shank or projection by which it may be secured in the shoe or holder in or-' der that it may be used in the forging machine.

In the modification shown in Figs. 4: to 6, the patrix 12 is of preferably the same shape as the patrix of Figs. 1 and 2, exceptas to the shape of the finishing pattern and retaining wall, but the matrix here designated 17 isprovided with a recess, the lower portion of which is designated 18 and is somewhat narrower than the upper part of the recess, and in this lower part is formed 011 the block or body 11 a shank 11 which, after the die is removed from the matrix, is

planed or shaped with a reverse taper to that shown 111 Fig. 1 so as to assume a dove-,

tail shape and enable the die to be secured with a key in a suitable shoe or holder of the forging machine.

As before stated, the retaining wall may extend either wholly or'partially around the finishing die, and in Fig. 6 the retaining wall here designated 19 is continuous and extends entirely around the finishing pattern 20 which is so shaped that the continuous retaining wall is required or desired to protect all portions of the pattern from breakage and to hold in the metal and to produce an accurate sharply defined pattern at all points.

The retaining wall forms in the die which is forged a grooveor projection which is of course of no advantage in the die, and before the die is used this groove is filled flush with the face of the die with metal-by means of an oxyacetylene torch, electric welding machine or other suitable apparatus.

Preferably the retaining wall is provided with tapering sides, the inner sides being only slightly tapering and the outer sides having a' more decided t'aperso as to give the retaining wall the required strength and to enable it to be easily withdrawn from "the metal body. The retaining wall as here shown is slightly of less depth than'the'pattern which it surrounds. Under certain circumstances, however, that isto say with patterns of certain shapes or designs, it is desirable to have the retaining wall the same depth asthe pattern and in some instances of greater depth. I

In a companion application No. 93,839 filed April 27, 1916, I am claiming the method which is carried out by themaster dies or forging apparatus disclosed in this application and in asecond companion ap plication, Serial No. 93,835 also filed April 27, 1916, I have disclosed and am claiming a'niaster die which is constructed somewhat difierently from that disclosed herein, and

in said application, No. 98,8351 am claiming the broadsubject-matter which is common to said application and the present application. I Having thus described my invention, What I claim is:, s V

1. In means for forging dies for drop hammers,'presses and the like, a pair of master dies including 'amatrix adapted to *receivea block or body to be forged into'a die and a patrix having on its face a die pattern to be reproduced in the body of metal, and means on the patrix between the pattern and the sides of the patrix for pre:

venting lateralmovement of themetal away from the pattern.

2. In apparatus for forging diesfordrop hammers, presses'and the like, pair of master dies including a matrixwith a recess adapted to receive'a'blockor body of metal to be forged in a die, and a patrix adapted to enter a portion of the recess and provided on its face with a'die pattern, and means on said face'adj a'cent the pattern 'for protecting the patternagainst breakage.

3. In apparatus for forging dies for drop hammers, presses and the like, a matrix having a recess adapted to receive a block or body of metal to be forged and a patrix adapted to enter the recess and having on its face a die pattern and adjacent the pattern a retaining Wall in the form of a rib or projection adapted to cut into the metal being forged.

4. A master die for forging dies for drop hammers, presses and the like, said master die being in the form of a patrix having on the end thereof a pattern to be reproduced in the metal to be forged and having between the pattern and the sides of the die a flange or rib adapted to cut into the metal adjacent the pattern.

In testimony whereof, I hereunto alfix my signature.

ALBERT F. ARTHUR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

